EP3674565A1 - Hydraulic drive unit - Google Patents
Hydraulic drive unit Download PDFInfo
- Publication number
- EP3674565A1 EP3674565A1 EP18848326.7A EP18848326A EP3674565A1 EP 3674565 A1 EP3674565 A1 EP 3674565A1 EP 18848326 A EP18848326 A EP 18848326A EP 3674565 A1 EP3674565 A1 EP 3674565A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- sealed tank
- pump
- supply
- tank
- port
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000010720 hydraulic oil Substances 0.000 claims abstract description 50
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- 239000003921 oil Substances 0.000 claims description 52
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 2
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- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000012217 deletion Methods 0.000 description 1
- 230000037430 deletion Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 230000015654 memory Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B7/00—Systems in which the movement produced is definitely related to the output of a volumetric pump; Telemotors
- F15B7/005—With rotary or crank input
- F15B7/006—Rotary pump input
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D19/00—Degasification of liquids
- B01D19/0036—Flash degasification
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B23/00—Pumping installations or systems
- F04B23/02—Pumping installations or systems having reservoirs
- F04B23/025—Pumping installations or systems having reservoirs the pump being located directly adjacent the reservoir
- F04B23/028—Pumping installations or systems having reservoirs the pump being located directly adjacent the reservoir the pump being mounted on top of the reservoir
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F04B53/06—Venting
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
- F15B1/26—Supply reservoir or sump assemblies
- F15B1/265—Supply reservoir or sump assemblies with pressurised main reservoir
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/04—Special measures taken in connection with the properties of the fluid
- F15B21/044—Removal or measurement of undissolved gas, e.g. de-aeration, venting or bleeding
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/38—Control of exclusively fluid gearing
- F16H61/40—Control of exclusively fluid gearing hydrostatic
- F16H61/4174—Control of venting, e.g. removing trapped air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
- F04B1/20—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis having rotary cylinder block
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
- F04B1/26—Control
- F04B1/30—Control of machines or pumps with rotary cylinder blocks
- F04B1/32—Control of machines or pumps with rotary cylinder blocks by varying the relative positions of a swash plate and a cylinder block
- F04B1/324—Control of machines or pumps with rotary cylinder blocks by varying the relative positions of a swash plate and a cylinder block by changing the inclination of the swash plate
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/005—Filling or draining of fluid systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/04—Special measures taken in connection with the properties of the fluid
- F15B21/041—Removal or measurement of solid or liquid contamination, e.g. filtering
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/04—Special measures taken in connection with the properties of the fluid
- F15B21/042—Controlling the temperature of the fluid
- F15B21/0423—Cooling
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2201/00—Accumulators
- F15B2201/40—Constructional details of accumulators not otherwise provided for
- F15B2201/415—Gas ports
- F15B2201/4155—Gas ports having valve means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/205—Systems with pumps
- F15B2211/20507—Type of prime mover
- F15B2211/20515—Electric motor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/205—Systems with pumps
- F15B2211/2053—Type of pump
- F15B2211/20546—Type of pump variable capacity
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/205—Systems with pumps
- F15B2211/2053—Type of pump
- F15B2211/20561—Type of pump reversible
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/27—Directional control by means of the pressure source
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/50—Pressure control
- F15B2211/505—Pressure control characterised by the type of pressure control means
- F15B2211/50509—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means
- F15B2211/50518—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means using pressure relief valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/50—Pressure control
- F15B2211/515—Pressure control characterised by the connections of the pressure control means in the circuit
- F15B2211/5157—Pressure control characterised by the connections of the pressure control means in the circuit being connected to a pressure source and a return line
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/50—Pressure control
- F15B2211/515—Pressure control characterised by the connections of the pressure control means in the circuit
- F15B2211/5159—Pressure control characterised by the connections of the pressure control means in the circuit being connected to an output member and a return line
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/60—Circuit components or control therefor
- F15B2211/61—Secondary circuits
- F15B2211/611—Diverting circuits, e.g. for cooling or filtering
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/60—Circuit components or control therefor
- F15B2211/61—Secondary circuits
- F15B2211/613—Feeding circuits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/60—Circuit components or control therefor
- F15B2211/615—Filtering means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/60—Circuit components or control therefor
- F15B2211/62—Cooling or heating means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/60—Circuit components or control therefor
- F15B2211/625—Accumulators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/60—Circuit components or control therefor
- F15B2211/665—Methods of control using electronic components
- F15B2211/6651—Control of the prime mover, e.g. control of the output torque or rotational speed
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
- F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
- F15B2211/7051—Linear output members
- F15B2211/7053—Double-acting output members
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
- F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
- F15B2211/7058—Rotary output members
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B7/00—Systems in which the movement produced is definitely related to the output of a volumetric pump; Telemotors
- F15B7/008—Systems in which the movement produced is definitely related to the output of a volumetric pump; Telemotors with rotary output
Definitions
- the present invention relates to a closed-circuit type hydraulic drive unit that drives a hydraulic actuator including a pair of supply-discharge ports.
- a drive unit for driving a hydraulic actuator including a pair of supply-discharge ports such as a double-acting hydraulic cylinder or a hydraulic motor
- a closed circuit refers to a circuit in which return oil from the hydraulic actuator is returned to a pump
- an "open circuit” refers to a circuit in which the return oil is returned to a tank.
- the pump includes a pair of pump ports, and the pair of pump ports is connected to the pair of supply-discharge ports via a pair of supply-discharge lines.
- the delivery side and the suction side of the pump ports are switched with each other, and also, the supply side and the discharge side of the supply-discharge ports are switched with each other, and thereby the moving direction of the hydraulic actuator is changed.
- the closed circuit is also provided with a tank for storing hydraulic oil, and the tank is used for collecting a surplus amount of the hydraulic oil delivered from the pump and replenishing the suction side of the pump with the hydraulic oil.
- the supply-discharge lines are provided with direction switching valves for removing air accumulated in the closed circuit.
- the direction switching valves switch the state of the supply-discharge ports between a state where the supply-discharge ports are connected to the pump ports and a state where the supply-discharge ports are connected to the tank.
- the closed circuit is provided with passages that form an open circuit via the direction switching valves so that the air in the closed circuit can be caused to flow out of the closed circuit into the tank together with the return oil.
- Patent Literature 1 since both the closed circuit and the open circuit exist inside the unit, the unit has a complex configuration.
- the tank is configured as a sealed tank.
- the tank if the air is caused to flow out of the closed circuit into the tank, the air is accumulated in the tank.
- the technique disclosed by Patent Literature 1 assumes that the air is released from the tank, and Patent Literature 1 does not disclose how to deal with accumulated air in the tank.
- an object of the present invention is to provide a closed-circuit type hydraulic drive unit that uses a sealed tank and is capable of readily removing air from the inside of the unit.
- a hydraulic drive unit is a hydraulic drive unit for driving a hydraulic actuator including a pair of supply-discharge ports.
- the hydraulic drive unit includes: a pump including a casing, a pair of pump ports, and an air vent port from which air in the casing is discharged to an outside of the casing together with hydraulic oil; a pair of supply-discharge lines that connects between the pair of pump ports and the pair of supply-discharge ports; a valve block that incorporates at least one valve therein, the at least one valve being provided on the pair of supply-discharge lines and/or oil passages connected to the pair of supply-discharge lines; a sealed tank that is connected to the pair of supply-discharge lines, the sealed tank storing the hydraulic oil; a suction line that leads the hydraulic oil in the sealed tank to the pump; a connecting line that connects the air vent port to the suction line; and a gas-liquid separator that separates air and the hydraulic oil flowing through the connecting line from each other, the gas-liquid
- the air can be collected, via the suction line and the valve block, in the casing of the pump, which is disposed upward of the sealed tank and the valve block.
- the air collected in the casing passes through the air vent port together with the hydraulic oil, and is led toward the suction line.
- the air is separated from the hydraulic oil by the gas-liquid separator, and is released to the outside.
- a flow directed to the suction side of the pump ports tends to occur in the suction line. Accordingly, a flow from the air vent port to the suction line also tends to occur, which facilitates discharging of the air from the casing. For these reasons, the air can be readily removed from the inside of the unit
- the hydraulic drive unit may further include: a frame to which the pump and the valve block are mounted; and a tank support mechanism that supports a bottom portion of the sealed tank from below.
- the sealed tank may be disposed such that a hydraulic oil inlet/outlet of the sealed tank faces upward, and such that the sealed tank is mountable to and detachable from the frame without disassembling a framework of the frame.
- the tank support mechanism may include: a fixing member fixed to the frame; and a movable member that is movable in an upward and downward direction relative to the fixing member. An upper end portion of the movable member may contact the bottom portion of the sealed tank from below.
- the sealed tank is disposed such that the sealed tank is mountable to and detachable from the frame without disassembling the framework of the frame, the work of mounting and detaching the sealed tank can be readily performed, and consequently, maintenance work on the sealed tank can be readily performed.
- the sealed tank mounting work by adjusting the position of the movable member in the upward and downward direction relative to the fixing member, the position of the sealed tank in the upward and downward direction is adjustable relative to the frame as well as the valve block and the pump mounted to the frame. That is, the tank support mechanism has a height adjustment function of adjusting the height of the tank. This makes it possible to suppress the application of an excessive stress to the piping connected to the sealed tank. Consequently, the durability of the unit is improved.
- the sealed tank may be a pressure-sealed tank.
- the bottom portion of the sealed tank may be provided with a gas pressure adjusting port for adjusting an internal gas pressure of the sealed tank.
- the upper end portion of the movable member may include a tubular member that surrounds the gas pressure adjusting port, the tubular member contacting the bottom portion of the sealed tank.
- the tubular member may be made of a material having a lower hardness than that of the sealed tank.
- the gas pressure adjusting port can be protected from the outside by the tubular member.
- the tubular member which receives the load of the sealed tank, is made of a material having a lower hardness than that of the sealed tank. This makes it possible to prevent the sealed tank, including the gas pressure adjusting port, from being damaged by the tubular member.
- the present invention makes it possible to provide a closed-circuit type hydraulic drive unit that uses a sealed tank and is capable of readily removing air from the inside of the unit.
- FIG. 1 is a circuit diagram of a hydraulic drive system 10 according to the embodiment.
- the hydraulic drive system 10 includes a hydraulic drive unit 1, which drives a hydraulic actuator 2.
- the hydraulic drive system 10 is installed, for example, in an industrial machine such as a hydraulic press or test equipment.
- the hydraulic actuator 2 includes a pair of supply-discharge ports 2a and 2b.
- the supply side and the discharge side of the pair of supply-discharge ports 2a and 2b are switched with each other in accordance with the moving direction of the hydraulic actuator 2.
- Supply-discharge piping members e.g., rubber hoses
- 3a and 3b which constitute a part of a pair of supply-discharge lines 13a and 13b, are connected to the supply-discharge ports 2a and 2b.
- the pair of supply-discharge lines 13a and 13b will be described below.
- the hydraulic actuator 2 may be configured as a double-acting single-rod hydraulic cylinder as shown in the drawing.
- the hydraulic actuator 2 may be configured as a double-acting double-rod hydraulic cylinder, or may be configured as a hydraulic motor.
- the rod moving direction of the hydraulic cylinder i.e., the moving direction of the hydraulic actuator 2
- the rotation direction of the hydraulic motor is changed by switching the supply side and the discharge side with each other.
- the hydraulic drive unit 1 includes an electric motor 11, a pump 12, a part of the pair of supply-discharge lines 13a and 13b, a sealed tank 17, a suction line 24, and a connecting line 27.
- the electric motor 11 is rotatable in forward and reverse directions.
- the rotation direction and the rotation speed of the electric motor 11 are controlled by a controller 91.
- the controller 91 includes a CPU and memories such as a ROM and RAM.
- command values of the rotation direction and the rotation speed are derived and outputted.
- the electric motor 11 is driven by a motor driver 92 (e.g., a servo driver or an inverter), which operates in accordance with the command values outputted from the controller.
- the electric motor 11 is provided with a pulse generator 11a. Feedback control using a signal outputted from the pulse generator 11a is applied to the control of driving the electric motor 11.
- the pump 12 is a variable displacement swash plate pump of a bidirectional rotation type.
- the pump 12 includes a pair of pump ports 12a and 12b.
- the pair of pump ports 12a and 12b is configured such that the delivery side and the suction side of the pump ports 12a and 12b are switchable with each other in accordance with the rotation direction of the electric motor 11.
- the first pump port 12a is connected to the first supply-discharge port 2a of the hydraulic actuator 2 via the first supply-discharge line 13a.
- the second pump port 12b is connected to the second supply-discharge port 2b of the hydraulic actuator 2 via the second supply-discharge line 13b.
- the pump 12 may be a bent axis pump.
- the pump 12 may be an over-center pump configured such that the delivery side and the suction side of the pump ports 12a and 12b are switchable with each other by tilting the swash plate or the bent axis over the center to one side or the other side, even though the rotation direction remains the same direction.
- an engine may serve as the driving source of the pump 12.
- the first supply-discharge line 13a is constituted by the aforementioned supply-discharge piping member 3a and an internal passage 40a formed inside a valve block 40.
- the second supply-discharge line 13b is constituted by the aforementioned supply-discharge piping member 3b and an internal passage 40b formed inside the valve block 40.
- the internal passages 40a and 40b are connected to actuator-side supply-discharge ports 46a and 46b provided at the surface of the valve block 40, and end portions of the supply-discharge piping members 3a and 3b are connected to the ports 46a and 46b, respectively. In this manner, the pair of supply-discharge lines 13a and 13b is configured.
- supply-discharge lines 13a and 13b refers to the internal passages 40a and 40b included in the hydraulic drive unit 1, unless otherwise specified.
- the delivery side and the suction side of the pump ports 12a and 12b are switched with each other, and in accordance therewith, the supply side and the discharge side of the supply-discharge ports 2a and 2b of the hydraulic actuator 2 are switched with each other.
- a first relief passage 15a is branched off from the first supply-discharge line 13a, and a first relief valve 16a is provided on the first relief passage 15a.
- a second relief passage 15b is branched off from the second supply-discharge line 13b, and a second relief valve 16b is provided on the second relief passage 15b.
- the first relief passage 15a and the second relief passage 15b are connected to a tank line 18, which extends from an oil inlet/outlet 17a of the sealed tank 17.
- the supply-discharge lines 13a and 13b are connected to the sealed tank 17 via the corresponding relief passages 15a and 15b (and the relief valves 16a and 16b provided thereon) and the tank line 18. It should be noted that an end portion of the tank line 18 is provided with an oil supply port 19.
- the sealed tank 17 can be replenished with hydraulic oil by pouring the hydraulic oil from the outside of the unit 1 through the oil supply port 19.
- a check valve 20, a check valve 21, an oil filter 22, and an oil cooler 23 are arranged on the tank line 18 in this order in a direction from the oil supply port 19 toward the sealed tank 17.
- a connection point at which the tank line 18 and the relief passages 15a and 15b are connected to each other is positioned between the check valves 20 and 21 on the tank line 18.
- the check valve 20 prevents such a reverse flow that the hydraulic oil flowing into the tank line 18 from the relief passages 15a and 15b flows reversely toward the oil supply port 19.
- the check valve 21 prevents such a reverse flow that the hydraulic oil flowing out of the sealed tank 17 flows reversely toward the oil supply port 19. In other words, the check valve 21 guides the hydraulic oil flowing out of the sealed tank 17 toward the suction line 24.
- the suction line 24 connects the sealed tank 17 to the first supply-discharge line 13a and the second supply-discharge line 13b, and leads the hydraulic oil in the sealed tank 17 to the pump 12.
- the suction line 24 includes: a single-line shared portion 24c, which is branched off from the tank line 18; and a first branched portion 24a and a second branched portion 24b, which are branched off from the shared portion 24c.
- a connection point at which the line 18 and the line 24 are connected to each other is positioned between the oil cooler 23 and the oil inlet/outlet 17a on the tank line 18.
- the first branched portion 24a is connected to the first supply-discharge line 13a, and the second branched portion 24b is connected to the second supply-discharge line 13b.
- the first branched portion 24a and the second branched portion 24b are provided with a check valve 25a and a check valve 25b, respectively.
- the check valves 25a and 25b prevent the hydraulic oil flowing through the supply-discharge lines 13a and 13b from flowing into the suction line 24.
- connection point at which the first supply-discharge line 13a and the first branched portion 24a are connected to each other, and a connection point at which the first supply-discharge line 13a and the first relief passage 15a are connected to each other, are arranged on the first supply-discharge line 13a in this order in a direction from the first pump port 12a toward the first supply-discharge port 2a. Connection points are also arranged on the second supply-discharge line 13b in the same manner.
- the pump 12 includes: a drain port 12c, from which surplus oil in the pump 12 is released; and an air vent port 12d, from which air accumulated in the pump 12 is discharged together with the hydraulic oil.
- the drain port 12c is connected to the tank line 18 via a pump drain line 26.
- a connection point at which the lines 18 and 26 are connected to each other is positioned between the oil filter 22 and the oil cooler 23 on the tank line 18.
- the air vent port 12d is connected to the suction line 24 (in this example, the shared portion 24c of the suction line 24) via the connecting line 27.
- a gas-liquid separator 28 is interposed in the connecting line 27.
- the air passage 29 is provided with an air vent valve 30, which opens and closes the air passage 29.
- the gas-liquid separator 28 separates the air and the hydraulic oil flowing through the connecting line 27 from each other, and supplies the separated hydraulic oil to the suction line 24 while releasing the separated air to the outside of the connecting line 27.
- the air is led from the gas-liquid separator 28 to the air passage 29, and released to the outside of the unit 1 when the air vent valve 30 is opened.
- the first pump port 12a acts as a delivery port
- the second pump port 12b acts as a suction port
- the first supply-discharge line 13a acts as a supply line through which the pressure oil delivered from the delivery port flows.
- the first supply-discharge port 2a acts as a supply port to which the pressure oil is supplied.
- the second supply-discharge port 2b acts as a discharge port from which the return oil is discharged.
- the second supply-discharge line 13b acts as a discharge line through which the return oil flows.
- the return oil is returned to the second pump port 12b acting as a suction port.
- the first pump port 12a acts as a suction port
- the second pump port 12b acts as a delivery port
- the first supply-discharge line 13a acts as a discharge line
- the second supply-discharge line 13b acts as a supply line
- the first supply-discharge port 2a acts as a discharge port
- the second supply-discharge port 2b acts as a supply port.
- a supply oil amount required per unit moving distance of the rod varies from a discharge oil amount required per unit moving distance of the rod. If the discharge oil amount is insufficient relative to the supply oil amount, the hydraulic oil in the sealed tank 17 is supplied to the discharge line via the suction line 24, and is led to the suction port of the pump 12.
- Each of the relief valves 16a and 16b sets a hydraulic supply pressure to the hydraulic actuator 2.
- the hydraulic oil that has flowed from the supply line to the relief passage 15a or 15b due to the function of the relief valve 16a or 16b flows into the tank line 18.
- the hydraulic oil discharged from the drain port 12c flows into the tank line 18 via the pump drain line 26.
- the hydraulic oil that has thus flowed into the tank line 18 is purified by the oil filter 22 and cooled by the oil cooler 23, and then flows into the suction line 24, or is stored in the sealed tank 17.
- the pump 12 includes a casing 31 and a pump drive shaft 32.
- the pump drive shaft 32 is rotatably supported by the casing 31.
- One end of the pump drive shaft 32 protrudes to the outside of the casing 31, and is coupled to an output shaft 34 of the electric motor 11 via a shaft coupling 33 outside the casing 31.
- the casing 31 is provided with the drain port 12c and the air vent port 12d.
- the hydraulic drive unit 1 includes the valve block 40.
- the valve block 40 is realized by a metal casing.
- the valve block 40 incorporates therein the following: (a part of) the supply-discharge lines 13a and 13b; a part or the entirety of the oil passages 15a, 15b, 18, 24, and 27, which are connected to the supply-discharge lines 13a and 13b; and at least one of the valves 16a, 16b, 20, 21, 25a, and 25b provided on the supply-discharge lines 13a and 13b and/or the oil passages 15a, 15b, 18, 24, and 27 connected thereto.
- the oil filter 22 is also accommodated in the valve block 40.
- the sealed tank 17 and the oil cooler 23 are provided separately from the valve block 40 and the pump 12.
- the surface of the valve block 40 is provided with a plurality of ports.
- the oil supply port 19, which is an end portion of the tank line 18, is formed at the surface of the valve block 40.
- the surface of the valve block 40 is further provided with a cooler upstream port 41, a cooler downstream port 42, and a tank port 43 in association with the tank line 18.
- the cooler upstream port 41 is connected to the inlet port of the oil cooler 23, and the cooler downstream port 42 is connected to the outlet port of the oil cooler 23.
- the ports 41 and 42 may be connected to the ports of the oil cooler 23 by using rubber hoses. Alternatively, the casing surface of the oil cooler 23 may be appressed to the surface of the valve block 40, such that these ports are in communication with each other.
- the tank port 43 is connected to the oil inlet/outlet 17a of the sealed tank 17 via a piping member. Inside the valve block 40, the oil supply port 19 is connected to the cooler upstream port 41, and the cooler downstream port 42 is connected to the tank port 43.
- the entirety of the suction line 24 and the check valves 25a and 25b are incorporated in the valve block 40.
- the surface of the valve block 40 is provided with a connecting-line connection port 44.
- the connecting-line connection port 44 is branched off from the suction line 24 incorporated in the valve block 40.
- the connecting-line connection port 44 is open at the surface of the valve block 40, and constitutes an end portion of the connecting line 27.
- a piping member 81 connects between the connecting-line connection port 44 and the air vent port 12d, which is open in the casing 31 of the pump 12. In this manner, the connecting line 27 connecting the air vent port 12d to the suction line 24 is realized.
- the gas-liquid separator 28 is interposed in the piping member 81.
- the surface of the valve block 40 is provided with a first-pump-side supply-discharge port 45a and the actuator-side supply-discharge port 46a in association with the first supply-discharge line 13a, and is provided with a second-pump-side supply-discharge port 45b and the actuator-side supply-discharge port 46b in association with the second supply-discharge line 13b.
- the actuator-side supply-discharge ports 46a and 46b are connected to the supply-discharge ports 2a and 2b of the hydraulic actuator 2, respectively, via the supply-discharge piping members 3a and 3b.
- the surface of the casing 31 is placed over the surface in which the first-pump-side supply-discharge port 45a and the second-pump-side supply-discharge port 45b are open.
- the first pump port 12a communicates with the first-pump-side supply-discharge port 45a
- the second pump port 12b communicates with the second-pump-side supply-discharge port 45b.
- the casing 31 is placed on top of the valve block 40 (see FIG. 2 ).
- the ports 45a and 45b are formed at the upper surface of the valve block 40, and the casing 31 is placed on the upper surface of the valve block 40 from above.
- FIG. 2 is a perspective view of the hydraulic drive unit 1.
- the hydraulic drive unit 1 is a vertical unit.
- the hydraulic drive unit 1 includes a frame 50.
- the pump 12 and the valve block 40 are mounted to the frame 50.
- the framework of the frame 50 is constituted by a plurality of (e.g., four) pillar members 51 extending in the upward and downward direction.
- the valve block 40 and the pump 12 are disposed in the space inside the pillar members 51.
- the pump 12 is placed on top of the valve block 40, and the oil cooler 23 (not shown in FIG. 2 ) is mounted under the valve block 40.
- the sealed tank 17 is disposed outside the frame 50.
- the sealed tank 17 is disposed in the space outside the plurality of pillar members 51, or disposed outside the framework of the frame 50.
- the overall shape of the sealed tank 17 is cylindrical, and both end portions of the sealed tank 17 are formed as hemispherical projecting portions.
- a holder 52 is wound around the outer circumferential surface of the central portion of the sealed tank 17 in its axial direction, and the holder 52 is fixed to the pillar members 51 by screws. In this manner, the sealed tank 17 is mounted to the frame 50.
- the frame 50 includes a bracket 53, which protrudes to the outside of the pillar members 51.
- the bracket 53 is provided with a tank support mechanism 60.
- the tank support mechanism 60 supports the bottom portion of the sealed tank 17 from below.
- the sealed tank 17 is supported by the frame 50 via the tank support mechanism 60, and the oil inlet/outlet 17a of the sealed tank 17 faces upward.
- the sealed tank 17 is disposed lower than the valve block 40.
- the oil inlet/outlet 17a is positioned lower than the upper surface of the valve block 40, but higher than the lower surface of the valve block 40.
- the bottom portion of the sealed tank 17 is positioned lower than the lower surface of the valve block 40.
- the tank support mechanism 60 includes: a fixing member 61 fixed to the frame 50; and a movable member 62 movable in the upward and downward direction relative to the fixing member 61.
- the upper end portion of the movable member 62 contacts the bottom portion of the sealed tank 17 from below.
- the fixing member 61 is, for example, configured as a bolt.
- the movable member 62 is, for example, configured as a nut member screwed with the fixing member 61.
- the fixing member 61 is directed in the upward and downward direction, and one end thereof is placed on the bracket 53.
- the movable member 62 includes: a nut portion 62a having a female screw thread screwed with the fixing member 61; and a cup portion 62b positioned over the nut portion 62a and integrated with the nut portion 62a. It should be noted that the nut portion 62a and the cup portion 62b may be configured as separate portions from each other. A through-hole in which the fixing member 61 can be inserted is formed in the bottom wall of the cup portion 62b.
- the movable member 62 By rotating the movable member 62 relative to the fixing member 61, the movable member 62 can move straight in the axial direction of the fixing member 61.
- the cup portion 62b is formed at the upper end of the movable member 62.
- a tubular member 63 is fitted in the cup portion 62b, and the upper end of the tubular member 63 protrudes upward beyond the upper edge of the cup portion 62b.
- the tubular member 63 moves together with the movable member 62 in the upward and downward direction relative to the fixing member 61. That is, the upper end portion of the movable member 62 includes the tubular member 63.
- the tubular member 63 is made of a material that has a lower hardness and a lower mechanical strength than those of the movable member 62 and the sealed tank 17.
- each of the movable member 62 and the sealed tank 17 is made of a ferrous material such as stainless steel, whereas the tubular member 63 is made of synthetic resin, paper, aluminum, copper, or soft iron.
- the sealed tank 17 is a pressure-sealed tank.
- the bottom portion of the sealed tank 17 is provided with a gas pressure adjusting port 17b, which is used for adjusting the internal gas pressure of the sealed tank 17.
- the gas pressure adjusting port 17b protrudes cylindrically from the bottom portion of the sealed tank 17.
- the fixing member 61, the movable member 62, and the tubular member 63 are arranged substantially coaxially with the gas pressure adjusting port 17b.
- the internal diameter of the tubular member 63 is greater than the external diameter of the gas pressure adjusting port 17b.
- the shaft length (i.e., the height) of the tubular member 63 is greater than the shaft length (i.e., the amount of protrusion from the bottom portion of the tank) of the gas pressure adjusting port 17b.
- the tank support mechanism 60 is attached to the frame 50, and the tank support mechanism 60 and the sealed tank 17 are placed on the bracket 53. Since the bracket 53 protrudes to the space outside the pillar members 51 of the frame 50, the work of placing the sealed tank 17 can be readily performed. Moreover, the work of placing the sealed tank 17 can be performed without disassembling the framework of the frame 50.
- the holder 52 is wound around the outer circumferential surface of the sealed tank 17, and temporarily fixed to the pillar members 51 so that the sealed tank 17 can slide against the holder 52 in the upward and downward direction.
- the position of the sealed tank 17 in the upward and downward direction relative to the frame 50 is adjusted.
- the holder 52 is fixed to the pillar members 51, and also, the oil inlet/outlet 17a is connected to the piping member.
- the tubular member 63 is made of a material having a lower hardness and a lower mechanical strength than those of the sealed tank 17, damage to the bottom portion of the sealed tank 17 can be prevented.
- the tubular member 63 surrounds the gas pressure adjusting port 17b without interfering with the gas pressure adjusting port 17b.
- the amount of protrusion of the gas pressure adjusting port 17b is less than the height of the tubular member 63, and an end portion of the gas pressure adjusting port 17b does not interfere with the cup portion 62b.
- the sealed tank 17 can be detached from the frame 50. Also when detaching the sealed tank 17 from the frame 50, it is unnecessary to disassemble the framework of the frame 50. When performing maintenance work on the sealed tank 17, detaching and re-mounting of the sealed tank 17 may be necessary in some cases. In such a case, since the sealed tank 17 is disposed outside the framework of the frame 50 such that the sealed tank 17 is mountable to and detachable from the frame 50 without disassembling the framework of the frame 50, the work of mounting and detaching the sealed tank 17 can be readily performed, and consequently, maintenance work on the sealed tank 17 can be readily performed.
- the frame 50 includes a top plate 54, which is provided on the upper end of the pillar members 51.
- a motor stay 55 is provided on the top plate 54, such that the motor stay 55 protrudes upward from the central portion of the top plate 54.
- the motor stay 55 includes: a cylindrical portion 55a protruding upward from the top plate 54; and a horizontal plate portion 55b provided on the upper end of the cylindrical portion 55a.
- the electric motor 11 in such an orientation that the axis thereof extends in the upward and downward direction is set on the horizontal plate portion 55b.
- the output shaft 34 of the electric motor 11 penetrates the horizontal plate portion 55b into the cylindrical portion 55a, and inside the cylindrical portion 55a, the output shaft 34 is coupled to the pump drive shaft 32 via the shaft coupling 33.
- the pump drive shaft 32 protrudes from the casing 31, and penetrates the top plate 54 into the cylindrical portion 55a.
- the pump 12 is disposed at the highest position.
- a sealed space 31a is formed inside the casing 31.
- the pump drive shaft 32 is inserted in the sealed space 31a, and is rotatably supported by an upper bearing 71 and a lower bearing 72, which are accommodated in the sealed space 31a.
- the upper bearing 71 is disposed upward of the lower bearing 72, and is accommodated in the upper part of the sealed space 31a.
- a swash plate 73 and a cylinder block 74 are disposed between the upper and lower bearings 71 and 72.
- a plurality of cylinder bores 75 are formed in the cylinder block 74, and pistons 76 are inserted in the respective cylinder bores 75.
- the pump 12 is of a fixed swash plate type.
- the cylinder block 74 rotates together with the pump drive shaft 32.
- Each piston 76 moves in a reciprocating manner in one of the cylinder bores 75 by a stroke corresponding to the inclination angle of the swash plate 73.
- the piston 76 protrudes upward from the cylinder bore 75, the hydraulic oil is sucked into the cylinder bore 75 via one of the pump ports 12a and 12b.
- the piston 76 is pushed into the cylinder bore 75, the hydraulic oil is delivered from the cylinder bore 75 to the other one of the pump ports 12a and 12b.
- the hydraulic oil acts as a lubricant for lubricating these components.
- the hydraulic oil that leaks from either one of the pump port 12a or 12b of a higher pressure flows into the casing 31, and the sealed space 31a is filled with the hydraulic oil.
- the air vent port 12d extends in a radial direction through the wall of the casing 31, and is open at the outer surface of the casing 31.
- the air entering the sealed space 31a together with the hydraulic oil is accumulated in the upper part of the sealed space 31a.
- the air vent port 12d is positioned in the upper part of the sealed space 31a, and is in communication with the space where the upper bearing 71 is accommodated. For this reason, the air accumulated in the sealed space 31a can be readily discharged to the outside of the casing 31, and also, lubricant insufficiency for the lubrication-requiring components in the casing 31 can be avoided.
- the gas-liquid separator 28 and the pump 12 are disposed side by side, and the gas-liquid separator 28 is mounted to the lower surface of the top plate 54.
- the air passage 29 protrudes upward from the top plate 54.
- the air vent valve 30 is provided at the upper end of the air passage 29, such that the air vent valve 30 and the motor stay 55 are disposed side by side.
- the piping member 81 which connects the air vent port 12d to the connecting-line connection port 44, includes a first piping member 81a and a second piping member 81b.
- the first piping member 81a connects the air vent port 12d to the gas-liquid separator 28, and the second piping member 81b connects the gas-liquid separator 28 to the connecting-line connection port 44.
- the first piping member 81a extends substantially horizontally, and is capable of suppressing the accumulation, in the first piping member 81a, of air that is discharged from the air vent port 12d.
- the drain port 12c has a greater diameter than that of the air vent port 12d.
- the hydraulic oil flowing from the drain port 12c is subjected to passing resistance when passing through the oil cooler 23. Consequently, a flow of the hydraulic oil through the connecting line 27 is obtained. Accordingly, the hydraulic oil smoothly flows to the air vent port 12d, and air can be removed from the casing 31 together with the hydraulic oil.
- the hydraulic drive unit 1 is of a closed circuit type.
- the hydraulic drive unit 1 includes: the sealed tank 17, in which the hydraulic oil is stored; the pump 12; the valve block 40; the suction line 24, through which the hydraulic oil in the sealed tank 17 is supplied to one of the pair of pump ports 12a and 12b, the one port acting as a suction port; the connecting line 27, which connects the air vent port 12d of the pump 12 to the suction line 24; and the gas-liquid separator 28, which separates the air and the hydraulic oil flowing through the connecting line from each other.
- the valve block 40 incorporates therein the following: a part of the pair of supply-discharge lines 13a and 13b, which connects the pair of pump ports 12a and 12b to the pair of supply-discharge ports 2a and 2b of the hydraulic actuator 2; and at least one of the valves 16a, 16b, 20, 21, 25a, and 25b provided on the pair of supply-discharge lines 13a and 13b and/or the oil passages 15a, 15b, 18, and 24 connected thereto.
- the pump 12 is placed on top of the valve block 40, and is disposed upward of the sealed tank 17.
- the air can be collected, via the suction line 24 and the valve block 40, in the casing 31 of the pump 12, which is disposed upward of the sealed tank 17 and the valve block 40.
- the air collected in the casing 31 passes through the air vent port 12d together with the hydraulic oil, and is led toward the suction line 24.
- the air is separated from the hydraulic oil by the gas-liquid separator 28, and is released to the outside.
- a flow directed to the suction side of the pump ports 12a and 12b tends to occur in the suction line 24. Accordingly, a flow from the air vent port 12d to the suction line 24 also tends to occur, which facilitates discharging of the air from the casing 31. For these reasons, the air can be readily removed from the inside of the unit 1.
- the sealed tank 17 is mounted to the frame 50, such that the oil inlet/outlet 17a faces upward. Therefore, even if air is present in the sealed tank 17, the air gathers near the oil inlet/outlet 17a in the upper part of the sealed tank 17. Accordingly, the air is readily led to the pump 12 together with the hydraulic oil via the oil inlet/outlet 17a and the suction line 24. This makes it possible to suppress the accumulation of air in the sealed tank 17.
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Abstract
Description
- The present invention relates to a closed-circuit type hydraulic drive unit that drives a hydraulic actuator including a pair of supply-discharge ports.
- There are cases where a drive unit for driving a hydraulic actuator including a pair of supply-discharge ports, such as a double-acting hydraulic cylinder or a hydraulic motor, is configured as a "closed circuit". It should be noted that the closed circuit herein refers to a circuit in which return oil from the hydraulic actuator is returned to a pump, whereas an "open circuit" refers to a circuit in which the return oil is returned to a tank.
- In the closed circuit, the pump includes a pair of pump ports, and the pair of pump ports is connected to the pair of supply-discharge ports via a pair of supply-discharge lines. In accordance with the rotation direction of the pump, the delivery side and the suction side of the pump ports are switched with each other, and also, the supply side and the discharge side of the supply-discharge ports are switched with each other, and thereby the moving direction of the hydraulic actuator is changed. Usually, the closed circuit is also provided with a tank for storing hydraulic oil, and the tank is used for collecting a surplus amount of the hydraulic oil delivered from the pump and replenishing the suction side of the pump with the hydraulic oil.
- In
Patent Literature 1, the supply-discharge lines are provided with direction switching valves for removing air accumulated in the closed circuit. The direction switching valves switch the state of the supply-discharge ports between a state where the supply-discharge ports are connected to the pump ports and a state where the supply-discharge ports are connected to the tank. The closed circuit is provided with passages that form an open circuit via the direction switching valves so that the air in the closed circuit can be caused to flow out of the closed circuit into the tank together with the return oil. - PTL 1: Japanese Laid-Open Utility Model Application Publication No.
H07-2606 - However, in
Patent Literature 1, since both the closed circuit and the open circuit exist inside the unit, the unit has a complex configuration. In some other known techniques, the tank is configured as a sealed tank. However, in such a case where the tank is configured as a sealed tank, if the air is caused to flow out of the closed circuit into the tank, the air is accumulated in the tank. The technique disclosed byPatent Literature 1 assumes that the air is released from the tank, andPatent Literature 1 does not disclose how to deal with accumulated air in the tank. - In view of the above, an object of the present invention is to provide a closed-circuit type hydraulic drive unit that uses a sealed tank and is capable of readily removing air from the inside of the unit.
- A hydraulic drive unit according to one aspect of the present invention is a hydraulic drive unit for driving a hydraulic actuator including a pair of supply-discharge ports. The hydraulic drive unit includes: a pump including a casing, a pair of pump ports, and an air vent port from which air in the casing is discharged to an outside of the casing together with hydraulic oil; a pair of supply-discharge lines that connects between the pair of pump ports and the pair of supply-discharge ports; a valve block that incorporates at least one valve therein, the at least one valve being provided on the pair of supply-discharge lines and/or oil passages connected to the pair of supply-discharge lines; a sealed tank that is connected to the pair of supply-discharge lines, the sealed tank storing the hydraulic oil; a suction line that leads the hydraulic oil in the sealed tank to the pump; a connecting line that connects the air vent port to the suction line; and a gas-liquid separator that separates air and the hydraulic oil flowing through the connecting line from each other, the gas-liquid separator supplying the separated hydraulic oil to the suction line while releasing the separated air from the connecting line. The pump is disposed upward of the valve block and the sealed tank in a vertical direction.
- According to the above configuration, even if air enters the sealed tank, the air can be collected, via the suction line and the valve block, in the casing of the pump, which is disposed upward of the sealed tank and the valve block. The air collected in the casing passes through the air vent port together with the hydraulic oil, and is led toward the suction line. The air is separated from the hydraulic oil by the gas-liquid separator, and is released to the outside. A flow directed to the suction side of the pump ports tends to occur in the suction line. Accordingly, a flow from the air vent port to the suction line also tends to occur, which facilitates discharging of the air from the casing. For these reasons, the air can be readily removed from the inside of the unit
- The hydraulic drive unit may further include: a frame to which the pump and the valve block are mounted; and a tank support mechanism that supports a bottom portion of the sealed tank from below. The sealed tank may be disposed such that a hydraulic oil inlet/outlet of the sealed tank faces upward, and such that the sealed tank is mountable to and detachable from the frame without disassembling a framework of the frame. The tank support mechanism may include: a fixing member fixed to the frame; and a movable member that is movable in an upward and downward direction relative to the fixing member. An upper end portion of the movable member may contact the bottom portion of the sealed tank from below.
- When performing maintenance work on the sealed tank, detaching the sealed tank from the unit and re-mounting the sealed tank to the unit may be necessary in some cases. In such a case, according to the above configuration, since the sealed tank is disposed such that the sealed tank is mountable to and detachable from the frame without disassembling the framework of the frame, the work of mounting and detaching the sealed tank can be readily performed, and consequently, maintenance work on the sealed tank can be readily performed. In the sealed tank mounting work, by adjusting the position of the movable member in the upward and downward direction relative to the fixing member, the position of the sealed tank in the upward and downward direction is adjustable relative to the frame as well as the valve block and the pump mounted to the frame. That is, the tank support mechanism has a height adjustment function of adjusting the height of the tank. This makes it possible to suppress the application of an excessive stress to the piping connected to the sealed tank. Consequently, the durability of the unit is improved.
- The sealed tank may be a pressure-sealed tank. The bottom portion of the sealed tank may be provided with a gas pressure adjusting port for adjusting an internal gas pressure of the sealed tank. The upper end portion of the movable member may include a tubular member that surrounds the gas pressure adjusting port, the tubular member contacting the bottom portion of the sealed tank. The tubular member may be made of a material having a lower hardness than that of the sealed tank.
- According to the above configuration, the gas pressure adjusting port can be protected from the outside by the tubular member. The tubular member, which receives the load of the sealed tank, is made of a material having a lower hardness than that of the sealed tank. This makes it possible to prevent the sealed tank, including the gas pressure adjusting port, from being damaged by the tubular member.
- The present invention makes it possible to provide a closed-circuit type hydraulic drive unit that uses a sealed tank and is capable of readily removing air from the inside of the unit.
-
-
FIG. 1 is a circuit diagram of a hydraulic drive system according to an embodiment. -
FIG. 2 is a perspective view of a hydraulic drive unit according to the embodiment. -
FIG. 3 is a sectional view of a tank support mechanism according to the embodiment. -
FIG. 4 is a sectional view of a pump according to the embodiment. - Hereinafter, an embodiment is described with reference to the drawings. In the drawings, the same or corresponding elements are denoted by the same reference signs, and repeating the same detailed descriptions is avoided below.
-
FIG. 1 is a circuit diagram of ahydraulic drive system 10 according to the embodiment. Thehydraulic drive system 10 includes ahydraulic drive unit 1, which drives ahydraulic actuator 2. Thehydraulic drive system 10 is installed, for example, in an industrial machine such as a hydraulic press or test equipment. - The
hydraulic actuator 2 includes a pair of supply-discharge ports discharge ports hydraulic actuator 2. Supply-discharge piping members (e.g., rubber hoses) 3a and 3b, which constitute a part of a pair of supply-discharge lines discharge ports discharge lines hydraulic actuator 2 may be configured as a double-acting single-rod hydraulic cylinder as shown in the drawing. Alternatively, thehydraulic actuator 2 may be configured as a double-acting double-rod hydraulic cylinder, or may be configured as a hydraulic motor. In a case where thehydraulic actuator 2 is configured as a hydraulic cylinder, the rod moving direction of the hydraulic cylinder (i.e., the moving direction of the hydraulic actuator 2) is changed by switching the supply side and the discharge side with each other. In a case where thehydraulic actuator 2 is configured as a hydraulic motor, the rotation direction of the hydraulic motor (i.e., the moving direction of the hydraulic actuator 2) is changed by switching the supply side and the discharge side with each other. - The
hydraulic drive unit 1 includes anelectric motor 11, apump 12, a part of the pair of supply-discharge lines tank 17, asuction line 24, and a connectingline 27. - The
electric motor 11 is rotatable in forward and reverse directions. The rotation direction and the rotation speed of theelectric motor 11 are controlled by acontroller 91. Thecontroller 91 includes a CPU and memories such as a ROM and RAM. As a result of the CPU executing a program stored in the ROM, command values of the rotation direction and the rotation speed are derived and outputted. Theelectric motor 11 is driven by a motor driver 92 (e.g., a servo driver or an inverter), which operates in accordance with the command values outputted from the controller. Theelectric motor 11 is provided with apulse generator 11a. Feedback control using a signal outputted from thepulse generator 11a is applied to the control of driving theelectric motor 11. - As one example, the
pump 12 is a variable displacement swash plate pump of a bidirectional rotation type. Thepump 12 includes a pair ofpump ports pump ports pump ports electric motor 11. Thefirst pump port 12a is connected to the first supply-discharge port 2a of thehydraulic actuator 2 via the first supply-discharge line 13a. Thesecond pump port 12b is connected to the second supply-discharge port 2b of thehydraulic actuator 2 via the second supply-discharge line 13b. - Alternatively, the
pump 12 may be a bent axis pump. Further alternatively, thepump 12 may be an over-center pump configured such that the delivery side and the suction side of thepump ports electric motor 11, an engine may serve as the driving source of thepump 12. - The first supply-
discharge line 13a is constituted by the aforementioned supply-discharge piping member 3a and an internal passage 40a formed inside avalve block 40. The second supply-discharge line 13b is constituted by the aforementioned supply-discharge piping member 3b and an internal passage 40b formed inside thevalve block 40. The internal passages 40a and 40b are connected to actuator-side supply-discharge ports valve block 40, and end portions of the supply-discharge piping members ports discharge lines discharge lines hydraulic drive unit 1, unless otherwise specified. - In accordance with the rotation direction of the
electric motor 11, the delivery side and the suction side of thepump ports discharge ports hydraulic actuator 2 are switched with each other. - A
first relief passage 15a is branched off from the first supply-discharge line 13a, and afirst relief valve 16a is provided on thefirst relief passage 15a. Asecond relief passage 15b is branched off from the second supply-discharge line 13b, and asecond relief valve 16b is provided on thesecond relief passage 15b. Thefirst relief passage 15a and thesecond relief passage 15b are connected to atank line 18, which extends from an oil inlet/outlet 17a of the sealedtank 17. - The supply-
discharge lines tank 17 via the correspondingrelief passages relief valves tank line 18. It should be noted that an end portion of thetank line 18 is provided with anoil supply port 19. The sealedtank 17 can be replenished with hydraulic oil by pouring the hydraulic oil from the outside of theunit 1 through theoil supply port 19. - A
check valve 20, acheck valve 21, anoil filter 22, and anoil cooler 23 are arranged on thetank line 18 in this order in a direction from theoil supply port 19 toward the sealedtank 17. A connection point at which thetank line 18 and therelief passages check valves tank line 18. Thecheck valve 20 prevents such a reverse flow that the hydraulic oil flowing into thetank line 18 from therelief passages oil supply port 19. Thecheck valve 21 prevents such a reverse flow that the hydraulic oil flowing out of the sealedtank 17 flows reversely toward theoil supply port 19. In other words, thecheck valve 21 guides the hydraulic oil flowing out of the sealedtank 17 toward thesuction line 24. - The
suction line 24 connects the sealedtank 17 to the first supply-discharge line 13a and the second supply-discharge line 13b, and leads the hydraulic oil in the sealedtank 17 to thepump 12. In this example, thesuction line 24 includes: a single-line sharedportion 24c, which is branched off from thetank line 18; and a firstbranched portion 24a and a secondbranched portion 24b, which are branched off from the sharedportion 24c. A connection point at which theline 18 and theline 24 are connected to each other is positioned between theoil cooler 23 and the oil inlet/outlet 17a on thetank line 18. The firstbranched portion 24a is connected to the first supply-discharge line 13a, and the secondbranched portion 24b is connected to the second supply-discharge line 13b. The firstbranched portion 24a and the secondbranched portion 24b are provided with acheck valve 25a and acheck valve 25b, respectively. Thecheck valves discharge lines suction line 24. It should be noted that a connection point at which the first supply-discharge line 13a and the firstbranched portion 24a are connected to each other, and a connection point at which the first supply-discharge line 13a and thefirst relief passage 15a are connected to each other, are arranged on the first supply-discharge line 13a in this order in a direction from thefirst pump port 12a toward the first supply-discharge port 2a. Connection points are also arranged on the second supply-discharge line 13b in the same manner. - In addition to the pair of
pump ports pump 12 includes: adrain port 12c, from which surplus oil in thepump 12 is released; and anair vent port 12d, from which air accumulated in thepump 12 is discharged together with the hydraulic oil. Thedrain port 12c is connected to thetank line 18 via apump drain line 26. A connection point at which thelines oil filter 22 and theoil cooler 23 on thetank line 18. - The
air vent port 12d is connected to the suction line 24 (in this example, the sharedportion 24c of the suction line 24) via the connectingline 27. A gas-liquid separator 28 is interposed in the connectingline 27. Anair passage 29, which is open to the outside of the unit 1 (e.g., open to the atmosphere), is connected to the gas-liquid separator 28. Theair passage 29 is provided with anair vent valve 30, which opens and closes theair passage 29. The gas-liquid separator 28 separates the air and the hydraulic oil flowing through the connectingline 27 from each other, and supplies the separated hydraulic oil to thesuction line 24 while releasing the separated air to the outside of the connectingline 27. The air is led from the gas-liquid separator 28 to theair passage 29, and released to the outside of theunit 1 when theair vent valve 30 is opened. - In the
hydraulic drive unit 1 with the above-described circuit configuration, when theelectric motor 11 rotates in one direction, thefirst pump port 12a acts as a delivery port, and thesecond pump port 12b acts as a suction port. The first supply-discharge line 13a acts as a supply line through which the pressure oil delivered from the delivery port flows. The first supply-discharge port 2a acts as a supply port to which the pressure oil is supplied. The second supply-discharge port 2b acts as a discharge port from which the return oil is discharged. The second supply-discharge line 13b acts as a discharge line through which the return oil flows. The return oil is returned to thesecond pump port 12b acting as a suction port. On the other hand, when theelectric motor 11 rotates in the reverse direction, thefirst pump port 12a acts as a suction port, and thesecond pump port 12b acts as a delivery port. The first supply-discharge line 13a acts as a discharge line, and the second supply-discharge line 13b acts as a supply line. The first supply-discharge port 2a acts as a discharge port, and the second supply-discharge port 2b acts as a supply port. - In a case where the
hydraulic actuator 2 is a single-rod cylinder, a supply oil amount required per unit moving distance of the rod varies from a discharge oil amount required per unit moving distance of the rod. If the discharge oil amount is insufficient relative to the supply oil amount, the hydraulic oil in the sealedtank 17 is supplied to the discharge line via thesuction line 24, and is led to the suction port of thepump 12. - Each of the
relief valves hydraulic actuator 2. The hydraulic oil that has flowed from the supply line to therelief passage relief valve tank line 18. Also, the hydraulic oil discharged from thedrain port 12c flows into thetank line 18 via thepump drain line 26. The hydraulic oil that has thus flowed into thetank line 18 is purified by theoil filter 22 and cooled by theoil cooler 23, and then flows into thesuction line 24, or is stored in the sealedtank 17. - As shown in
FIG. 1 andFIG. 4 , thepump 12 includes acasing 31 and apump drive shaft 32. Thepump drive shaft 32 is rotatably supported by thecasing 31. One end of thepump drive shaft 32 protrudes to the outside of thecasing 31, and is coupled to anoutput shaft 34 of theelectric motor 11 via ashaft coupling 33 outside thecasing 31. Thecasing 31 is provided with thedrain port 12c and theair vent port 12d. - The
hydraulic drive unit 1 includes thevalve block 40. Thevalve block 40 is realized by a metal casing. Thevalve block 40 incorporates therein the following: (a part of) the supply-discharge lines oil passages discharge lines valves discharge lines oil passages oil filter 22 is also accommodated in thevalve block 40. The sealedtank 17 and theoil cooler 23 are provided separately from thevalve block 40 and thepump 12. - The surface of the
valve block 40 is provided with a plurality of ports. Theoil supply port 19, which is an end portion of thetank line 18, is formed at the surface of thevalve block 40. The surface of thevalve block 40 is further provided with a coolerupstream port 41, a coolerdownstream port 42, and atank port 43 in association with thetank line 18. The coolerupstream port 41 is connected to the inlet port of theoil cooler 23, and the coolerdownstream port 42 is connected to the outlet port of theoil cooler 23. Theports oil cooler 23 by using rubber hoses. Alternatively, the casing surface of theoil cooler 23 may be appressed to the surface of thevalve block 40, such that these ports are in communication with each other. Thetank port 43 is connected to the oil inlet/outlet 17a of the sealedtank 17 via a piping member. Inside thevalve block 40, theoil supply port 19 is connected to the coolerupstream port 41, and the coolerdownstream port 42 is connected to thetank port 43. - In this example, the entirety of the
suction line 24 and thecheck valves valve block 40. The surface of thevalve block 40 is provided with a connecting-line connection port 44. The connecting-line connection port 44 is branched off from thesuction line 24 incorporated in thevalve block 40. The connecting-line connection port 44 is open at the surface of thevalve block 40, and constitutes an end portion of the connectingline 27. A pipingmember 81 connects between the connecting-line connection port 44 and theair vent port 12d, which is open in thecasing 31 of thepump 12. In this manner, the connectingline 27 connecting theair vent port 12d to thesuction line 24 is realized. The gas-liquid separator 28 is interposed in the pipingmember 81. - The surface of the
valve block 40 is provided with a first-pump-side supply-discharge port 45a and the actuator-side supply-discharge port 46a in association with the first supply-discharge line 13a, and is provided with a second-pump-side supply-discharge port 45b and the actuator-side supply-discharge port 46b in association with the second supply-discharge line 13b. The actuator-side supply-discharge ports discharge ports hydraulic actuator 2, respectively, via the supply-discharge piping members casing 31 is placed over the surface in which the first-pump-side supply-discharge port 45a and the second-pump-side supply-discharge port 45b are open. As a result, thefirst pump port 12a communicates with the first-pump-side supply-discharge port 45a, and thesecond pump port 12b communicates with the second-pump-side supply-discharge port 45b. Thecasing 31 is placed on top of the valve block 40 (seeFIG. 2 ). Theports valve block 40, and thecasing 31 is placed on the upper surface of thevalve block 40 from above. -
FIG. 2 is a perspective view of thehydraulic drive unit 1. As shown inFIG. 2 , thehydraulic drive unit 1 is a vertical unit. Thehydraulic drive unit 1 includes aframe 50. Thepump 12 and thevalve block 40 are mounted to theframe 50. The framework of theframe 50 is constituted by a plurality of (e.g., four)pillar members 51 extending in the upward and downward direction. Thevalve block 40 and thepump 12 are disposed in the space inside thepillar members 51. Thepump 12 is placed on top of thevalve block 40, and the oil cooler 23 (not shown inFIG. 2 ) is mounted under thevalve block 40. - The sealed
tank 17 is disposed outside theframe 50. To be more specific, the sealedtank 17 is disposed in the space outside the plurality ofpillar members 51, or disposed outside the framework of theframe 50. The overall shape of the sealedtank 17 is cylindrical, and both end portions of the sealedtank 17 are formed as hemispherical projecting portions. Aholder 52 is wound around the outer circumferential surface of the central portion of the sealedtank 17 in its axial direction, and theholder 52 is fixed to thepillar members 51 by screws. In this manner, the sealedtank 17 is mounted to theframe 50. - The
frame 50 includes abracket 53, which protrudes to the outside of thepillar members 51. Thebracket 53 is provided with atank support mechanism 60. Thetank support mechanism 60 supports the bottom portion of the sealedtank 17 from below. The sealedtank 17 is supported by theframe 50 via thetank support mechanism 60, and the oil inlet/outlet 17a of the sealedtank 17 faces upward. Schematically speaking, the sealedtank 17 is disposed lower than thevalve block 40. It should be noted that the sealedtank 17 and thevalve block 40 are arranged side by side. The oil inlet/outlet 17a is positioned lower than the upper surface of thevalve block 40, but higher than the lower surface of thevalve block 40. The bottom portion of the sealedtank 17 is positioned lower than the lower surface of thevalve block 40. - As shown in
FIG. 3 , thetank support mechanism 60 includes: a fixingmember 61 fixed to theframe 50; and amovable member 62 movable in the upward and downward direction relative to the fixingmember 61. The upper end portion of themovable member 62 contacts the bottom portion of the sealedtank 17 from below. - The fixing
member 61 is, for example, configured as a bolt. Themovable member 62 is, for example, configured as a nut member screwed with the fixingmember 61. The fixingmember 61 is directed in the upward and downward direction, and one end thereof is placed on thebracket 53. Themovable member 62 includes: anut portion 62a having a female screw thread screwed with the fixingmember 61; and acup portion 62b positioned over thenut portion 62a and integrated with thenut portion 62a. It should be noted that thenut portion 62a and thecup portion 62b may be configured as separate portions from each other. A through-hole in which the fixingmember 61 can be inserted is formed in the bottom wall of thecup portion 62b. By rotating themovable member 62 relative to the fixingmember 61, themovable member 62 can move straight in the axial direction of the fixingmember 61. Thecup portion 62b is formed at the upper end of themovable member 62. Atubular member 63 is fitted in thecup portion 62b, and the upper end of thetubular member 63 protrudes upward beyond the upper edge of thecup portion 62b. Thetubular member 63 moves together with themovable member 62 in the upward and downward direction relative to the fixingmember 61. That is, the upper end portion of themovable member 62 includes thetubular member 63. Thetubular member 63 is made of a material that has a lower hardness and a lower mechanical strength than those of themovable member 62 and the sealedtank 17. For example, each of themovable member 62 and the sealedtank 17 is made of a ferrous material such as stainless steel, whereas thetubular member 63 is made of synthetic resin, paper, aluminum, copper, or soft iron. - The sealed
tank 17 is a pressure-sealed tank. The bottom portion of the sealedtank 17 is provided with a gaspressure adjusting port 17b, which is used for adjusting the internal gas pressure of the sealedtank 17. The gaspressure adjusting port 17b protrudes cylindrically from the bottom portion of the sealedtank 17. The fixingmember 61, themovable member 62, and thetubular member 63 are arranged substantially coaxially with the gaspressure adjusting port 17b. The internal diameter of thetubular member 63 is greater than the external diameter of the gaspressure adjusting port 17b. The shaft length (i.e., the height) of thetubular member 63 is greater than the shaft length (i.e., the amount of protrusion from the bottom portion of the tank) of the gaspressure adjusting port 17b. - Hereinafter, a method of mounting the sealed
tank 17 to theframe 50 is described with reference toFIG. 2 andFIG. 3 . Thetank support mechanism 60 is attached to theframe 50, and thetank support mechanism 60 and the sealedtank 17 are placed on thebracket 53. Since thebracket 53 protrudes to the space outside thepillar members 51 of theframe 50, the work of placing the sealedtank 17 can be readily performed. Moreover, the work of placing the sealedtank 17 can be performed without disassembling the framework of theframe 50. - The
holder 52 is wound around the outer circumferential surface of the sealedtank 17, and temporarily fixed to thepillar members 51 so that the sealedtank 17 can slide against theholder 52 in the upward and downward direction. Next, by moving themovable member 62 of thetank support mechanism 60 in the upward and downward direction, the position of the sealedtank 17 in the upward and downward direction relative to theframe 50 is adjusted. Then, theholder 52 is fixed to thepillar members 51, and also, the oil inlet/outlet 17a is connected to the piping member. - In the position adjustment in the upward and downward direction, an end portion of the piping member connected to the
tank port 43 of thevalve block 40 is brought close to the oil inlet/outlet 17a. In this manner, positional deviation between the oil inlet/outlet 17a and the piping member is absorbed, and thereby the piping member can be connected to the sealedtank 17, the positional deviation being caused by the following factors: assembling errors of theframe 50; mounting errors in mounting thevalve block 40 to theframe 50; tolerances of thevalve block 40; tolerances of the piping member; and tolerances of the sealedtank 17. This consequently makes it possible to suppress the application of an excessive stress to the piping member. - By thus mounting the sealed
tank 17 to theframe 50, the bottom portion of the sealedtank 17 contacts the upper end of thetubular member 63, and the load of the sealedtank 17 is received by thetubular member 63 of thetank support mechanism 60. Since thetubular member 63 is made of a material having a lower hardness and a lower mechanical strength than those of the sealedtank 17, damage to the bottom portion of the sealedtank 17 can be prevented. Thetubular member 63 surrounds the gaspressure adjusting port 17b without interfering with the gaspressure adjusting port 17b. The amount of protrusion of the gaspressure adjusting port 17b is less than the height of thetubular member 63, and an end portion of the gaspressure adjusting port 17b does not interfere with thecup portion 62b. Thus, by applying thetubular member 63, damage to the bottom portion of the sealedtank 17, in particularly, damage to the gaspressure adjusting port 17b, can be suppressed. - By following the above-described steps in the reverse order, the sealed
tank 17 can be detached from theframe 50. Also when detaching the sealedtank 17 from theframe 50, it is unnecessary to disassemble the framework of theframe 50. When performing maintenance work on the sealedtank 17, detaching and re-mounting of the sealedtank 17 may be necessary in some cases. In such a case, since the sealedtank 17 is disposed outside the framework of theframe 50 such that the sealedtank 17 is mountable to and detachable from theframe 50 without disassembling the framework of theframe 50, the work of mounting and detaching the sealedtank 17 can be readily performed, and consequently, maintenance work on the sealedtank 17 can be readily performed. - As shown in
FIG. 2 , theframe 50 includes atop plate 54, which is provided on the upper end of thepillar members 51. Amotor stay 55 is provided on thetop plate 54, such that themotor stay 55 protrudes upward from the central portion of thetop plate 54. The motor stay 55 includes: acylindrical portion 55a protruding upward from thetop plate 54; and ahorizontal plate portion 55b provided on the upper end of thecylindrical portion 55a. Theelectric motor 11 in such an orientation that the axis thereof extends in the upward and downward direction is set on thehorizontal plate portion 55b. Theoutput shaft 34 of theelectric motor 11 penetrates thehorizontal plate portion 55b into thecylindrical portion 55a, and inside thecylindrical portion 55a, theoutput shaft 34 is coupled to thepump drive shaft 32 via theshaft coupling 33. Thepump drive shaft 32 protrudes from thecasing 31, and penetrates thetop plate 54 into thecylindrical portion 55a. Among the hydraulic equipment constituting the hydraulic drive unit 1 (excluding theelectric motor 11, theshaft coupling 33, theair passage 29, and the air vent valve 30), thepump 12 is disposed at the highest position. - As shown in
FIG. 4 , a sealedspace 31a is formed inside thecasing 31. Thepump drive shaft 32 is inserted in the sealedspace 31a, and is rotatably supported by anupper bearing 71 and alower bearing 72, which are accommodated in the sealedspace 31a. Theupper bearing 71 is disposed upward of thelower bearing 72, and is accommodated in the upper part of the sealedspace 31a. Inside the sealedspace 31a, aswash plate 73 and acylinder block 74 are disposed between the upper andlower bearings cylinder block 74, andpistons 76 are inserted in the respective cylinder bores 75. - As one example, the
pump 12 is of a fixed swash plate type. When thepump drive shaft 32 rotates, thecylinder block 74 rotates together with thepump drive shaft 32. Eachpiston 76 moves in a reciprocating manner in one of the cylinder bores 75 by a stroke corresponding to the inclination angle of theswash plate 73. When thepiston 76 protrudes upward from the cylinder bore 75, the hydraulic oil is sucked into the cylinder bore 75 via one of thepump ports piston 76 is pushed into the cylinder bore 75, the hydraulic oil is delivered from the cylinder bore 75 to the other one of thepump ports - Inside the
casing 31, a large number of components require lubrication. Here, the hydraulic oil acts as a lubricant for lubricating these components. The hydraulic oil that leaks from either one of thepump port casing 31, and the sealedspace 31a is filled with the hydraulic oil. In the upper part of the sealedspace 31a, in particular, from the space where theupper bearing 71, which is disposed at the highest position among all the lubrication-requiring components, is accommodated, theair vent port 12d extends in a radial direction through the wall of thecasing 31, and is open at the outer surface of thecasing 31. - It is possible that air enters the sealed
space 31a together with the hydraulic oil. The air entering the sealedspace 31a together with the hydraulic oil is accumulated in the upper part of the sealedspace 31a. When the air is thus accumulated, it may cause insufficiency in the amount of lubricant for theupper bearing 71. Meanwhile, theair vent port 12d is positioned in the upper part of the sealedspace 31a, and is in communication with the space where theupper bearing 71 is accommodated. For this reason, the air accumulated in the sealedspace 31a can be readily discharged to the outside of thecasing 31, and also, lubricant insufficiency for the lubrication-requiring components in thecasing 31 can be avoided. - The gas-
liquid separator 28 and thepump 12 are disposed side by side, and the gas-liquid separator 28 is mounted to the lower surface of thetop plate 54. Theair passage 29 protrudes upward from thetop plate 54. Theair vent valve 30 is provided at the upper end of theair passage 29, such that theair vent valve 30 and themotor stay 55 are disposed side by side. The pipingmember 81, which connects theair vent port 12d to the connecting-line connection port 44, includes afirst piping member 81a and asecond piping member 81b. Thefirst piping member 81a connects theair vent port 12d to the gas-liquid separator 28, and thesecond piping member 81b connects the gas-liquid separator 28 to the connecting-line connection port 44.
Thefirst piping member 81a extends substantially horizontally, and is capable of suppressing the accumulation, in thefirst piping member 81a, of air that is discharged from theair vent port 12d. - It should be noted that, as shown in the drawing, the
drain port 12c has a greater diameter than that of theair vent port 12d. However, the hydraulic oil flowing from thedrain port 12c is subjected to passing resistance when passing through theoil cooler 23. Consequently, a flow of the hydraulic oil through the connectingline 27 is obtained. Accordingly, the hydraulic oil smoothly flows to theair vent port 12d, and air can be removed from thecasing 31 together with the hydraulic oil. - As described above, the
hydraulic drive unit 1 according to the present embodiment is of a closed circuit type. Thehydraulic drive unit 1 includes: the sealedtank 17, in which the hydraulic oil is stored; thepump 12; thevalve block 40; thesuction line 24, through which the hydraulic oil in the sealedtank 17 is supplied to one of the pair ofpump ports line 27, which connects theair vent port 12d of thepump 12 to thesuction line 24; and the gas-liquid separator 28, which separates the air and the hydraulic oil flowing through the connecting line from each other. Thevalve block 40 incorporates therein the following: a part of the pair of supply-discharge lines pump ports discharge ports hydraulic actuator 2; and at least one of thevalves discharge lines oil passages pump 12 is placed on top of thevalve block 40, and is disposed upward of the sealedtank 17. - Therefore, even if air enters the sealed
tank 17, the air can be collected, via thesuction line 24 and thevalve block 40, in thecasing 31 of thepump 12, which is disposed upward of the sealedtank 17 and thevalve block 40. The air collected in thecasing 31 passes through theair vent port 12d together with the hydraulic oil, and is led toward thesuction line 24. The air is separated from the hydraulic oil by the gas-liquid separator 28, and is released to the outside. A flow directed to the suction side of thepump ports suction line 24. Accordingly, a flow from theair vent port 12d to thesuction line 24 also tends to occur, which facilitates discharging of the air from thecasing 31. For these reasons, the air can be readily removed from the inside of theunit 1. - In addition, the sealed
tank 17 is mounted to theframe 50, such that the oil inlet/outlet 17a faces upward. Therefore, even if air is present in the sealedtank 17, the air gathers near the oil inlet/outlet 17a in the upper part of the sealedtank 17. Accordingly, the air is readily led to thepump 12 together with the hydraulic oil via the oil inlet/outlet 17a and thesuction line 24. This makes it possible to suppress the accumulation of air in the sealedtank 17. - Although the embodiment of the present invention has been described as above, suitable modifications, additions, and/or deletions can be made to the above-described configurations within the scope of the present invention.
-
- 1
- hydraulic drive unit
- 2
- hydraulic actuator
- 2a, 2b
- supply-discharge port
- 11
- electric motor
- 12
- pump
- 12a, 12b
- pump port
- 12c
- drain port
- 12d
- air vent port
- 13a, 13b
- supply-discharge line
- 17
- sealed tank
- 17a
- oil inlet/outlet
- 17b
- gas pressure adjusting port
- 24
- suction line
- 27
- connecting line
- 28
- gas-liquid separator
- 31
- casing
- 40
- valve block
- 50
- frame
- 60
- tank support mechanism
- 61
- fixing member
- 62
- movable member
- 63
- tubular member
Claims (3)
- A hydraulic drive unit for driving a hydraulic actuator including a pair of supply-discharge ports, the hydraulic drive unit comprising:a pump including a casing, a pair of pump ports, and an air vent port from which air in the casing is discharged to an outside of the casing together with hydraulic oil;a pair of supply-discharge lines that connects between the pair of pump ports and the pair of supply-discharge ports;a valve block that incorporates at least one valve therein, the at least one valve being provided on the pair of supply-discharge lines and/or oil passages connected to the pair of supply-discharge lines;a sealed tank that is connected to the pair of supply-discharge lines, the sealed tank storing the hydraulic oil;a suction line that leads the hydraulic oil in the sealed tank to the pump;a connecting line that connects the air vent port to the suction line; anda gas-liquid separator that separates air and the hydraulic oil flowing through the connecting line from each other, the gas-liquid separator supplying the separated hydraulic oil to the suction line while releasing the separated air from the connecting line, whereinthe pump is disposed upward of the valve block and the sealed tank in a vertical direction.
- The hydraulic drive unit according to claim 1, further comprising:a frame to which the pump and the valve block are mounted; anda tank support mechanism that supports a bottom portion of the sealed tank from below, whereinthe sealed tank is disposed such that a hydraulic oil inlet/outlet of the sealed tank faces upward, and such that the sealed tank is mountable to and detachable from the frame without disassembling a framework of the frame,the tank support mechanism includes:a fixing member fixed to the frame; anda movable member that is movable in an upward and downward direction relative to the fixing member, andan upper end portion of the movable member contacts the bottom portion of the sealed tank from below.
- The hydraulic drive unit according to claim 2, wherein
the sealed tank is a pressure-sealed tank,
the bottom portion of the sealed tank is provided with a gas pressure adjusting port for adjusting an internal gas pressure of the sealed tank,
the upper end portion of the movable member includes a tubular member that surrounds the gas pressure adjusting port, the tubular member contacting the bottom portion of the sealed tank, and
the tubular member is made of a material having a lower hardness than that of the sealed tank.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2017162232A JP6446103B1 (en) | 2017-08-25 | 2017-08-25 | Hydraulic drive unit |
PCT/JP2018/029753 WO2019039286A1 (en) | 2017-08-25 | 2018-08-08 | Hydraulic drive unit |
Publications (3)
Publication Number | Publication Date |
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EP3674565A1 true EP3674565A1 (en) | 2020-07-01 |
EP3674565A4 EP3674565A4 (en) | 2021-05-19 |
EP3674565B1 EP3674565B1 (en) | 2022-10-19 |
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EP18848326.7A Active EP3674565B1 (en) | 2017-08-25 | 2018-08-08 | Hydraulic drive unit |
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US (1) | US10982697B2 (en) |
EP (1) | EP3674565B1 (en) |
JP (1) | JP6446103B1 (en) |
WO (1) | WO2019039286A1 (en) |
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CN113669330B (en) * | 2021-06-24 | 2023-08-11 | 中国煤炭科工集团太原研究院有限公司 | Mining vehicle wet brake forced cooling system based on pneumatic control |
JP7001951B1 (en) * | 2021-07-16 | 2022-01-20 | 株式会社不二越 | Tank integrated pump |
CN113976574A (en) * | 2021-10-29 | 2022-01-28 | 徐州阿马凯液压技术有限公司 | Overturning oil control system and method suitable for hydraulic multi-way valve |
JP2024033716A (en) * | 2022-08-31 | 2024-03-13 | 川崎重工業株式会社 | Steering machine |
Family Cites Families (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2861550A (en) * | 1952-10-28 | 1958-11-25 | Westinghouse Electric Corp | Hydraulic power control valve |
US4064911A (en) * | 1976-11-17 | 1977-12-27 | Albrecht David E | Hydraulic fluid reservoir for a closed hydraulic system |
US4052852A (en) * | 1976-11-22 | 1977-10-11 | Caterpillar Tractor Co. | Constant pressure sealed fluid storage tank for hydraulic systems |
CN85104763B (en) * | 1985-06-13 | 1988-08-24 | 沈汉石 | Method and device for removing gas cells in a hydraulic system |
SE9303680L (en) * | 1993-05-25 | 1994-11-26 | Haakan Ingvast Produktutveckli | Liquid-cured system with device for degassing the liquid |
JP2607791Y2 (en) | 1993-06-18 | 2002-07-08 | カヤバ工業株式会社 | Cylinder hydraulic control circuit |
JP3678633B2 (en) * | 2000-06-12 | 2005-08-03 | 株式会社名機製作所 | Clamping device for injection molding machine with hydraulic closed circuit |
US6837047B2 (en) * | 2002-07-12 | 2005-01-04 | Parker-Hannifin Corporation | Hydraulic devices for smooth operations of hydrostatic transmission |
US7926410B2 (en) * | 2007-05-01 | 2011-04-19 | J.R. Automation Technologies, L.L.C. | Hydraulic circuit for synchronized horizontal extension of cylinders |
DE102011009044B4 (en) * | 2011-01-20 | 2015-09-10 | Lukas Hydraulik Gmbh | venting device |
CN104023807A (en) * | 2012-10-29 | 2014-09-03 | 株式会社Tnk | Circulation system for separating and removing bubbles from liquid |
US9863445B2 (en) * | 2014-02-28 | 2018-01-09 | Deere & Company | Reservoir with draining compartment |
US11137000B2 (en) * | 2014-10-10 | 2021-10-05 | MEA Inc. | Self-contained energy efficient hydraulic actuator system |
US20160138624A1 (en) * | 2014-11-14 | 2016-05-19 | Caterpillar Inc. | Hydraulic Power System with Aeration Sensing for a Mobile Machine |
WO2017070539A1 (en) * | 2015-10-23 | 2017-04-27 | Aoi (Advanced Oilfield Innovations, Dba A.O. International Ii, Inc.) | Prime mover system and methods utilizing balanced flow within bi-directional power units |
-
2017
- 2017-08-25 JP JP2017162232A patent/JP6446103B1/en active Active
-
2018
- 2018-08-08 WO PCT/JP2018/029753 patent/WO2019039286A1/en unknown
- 2018-08-08 EP EP18848326.7A patent/EP3674565B1/en active Active
- 2018-08-08 US US16/641,683 patent/US10982697B2/en active Active
Also Published As
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JP2019039503A (en) | 2019-03-14 |
EP3674565B1 (en) | 2022-10-19 |
JP6446103B1 (en) | 2018-12-26 |
US20200217334A1 (en) | 2020-07-09 |
EP3674565A4 (en) | 2021-05-19 |
WO2019039286A1 (en) | 2019-02-28 |
US10982697B2 (en) | 2021-04-20 |
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